Rotary shears.



Patented Sept. I6, |902.

G. w. Munn.

ROTARY SHEABS.

(Application ld May 9, 1901.)

2 Sheets-Sheet I.

(No Model.)

No. 7o9,|n. Patented sept. 16, |902.

' e. w. Munn. V

RDTARYSHEARS.

. (Application med May 9. 1901.) .um model.)

2 Sheets-Sheet 2.

UNITED STATES PATENT OFFICE.

GEORGE W. MUDD, OF MOBERLY, MISSOURI.

ROTARY SHEARS.

SPECIFICATION forming' part of Letters Patent No. 709,106, dated September 16, 19102.

Application filed May 9, 1901. Serial No. 59,419. (No mdel-l To @ZZ whom, t may concern:

Be itknown that LGEORGE W. MUDD,a citizen of the United States, residing at Moberly, Randolph county, Missouri, have invented a certain new and useful Improvement in Rotary Shears, ofwhich the following is a full, clear, and exact description, such as will en able others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyingr drawings; forming part of this specification, in which- Figure l is a side elevational view of my improved rotary shears. Fig. 2 is a front elevational View of the same. Fig. 3 is a top plan View. Fig. 4 is a plan view of the bedplate, showing the tem plet-rollers in position; and Fig. 5 is a front elevational View of the hed-plate shown in Fig. 4.

This invention relates to a new and useful improvement iu rotary shears designed especially for cutting sheet metal, the object being t-o construct a device of the character described which will be simple, compact, and cheap.

With these objects in View the invention consists in the arrangement, construction, and combination of the several parts, all as will be hereinafter described, and afterward pointed out in the claims.

In the drawings, A indicates the frame of the machine, which is formed of a yoke. This yoke-frame is provided with a suitable base, the yoke portion being integral therewith and consisting at its forward end of two cylindrical legs in vertical alinernen'r, said legs merging together at the rear end of the machine to form an eliptically-shaped body portion. A web extends upwardly from the top leg and provides bearings for a power-shaft.

These elements of the frame of the machine are suitably flanged and webbed, so as to reinforce each other for the purpose of obtaining the greatest amount of strength with the minimum amount of material.

B indicates a power-shaft carrying a pinion b and clutch mechanism c, coperating with a drivin g-pulley O. This power-shaft through this clutch mechanism is thrown into and out of engagement by an operating-handle D, having suitable connections with the sliding member of the clutch, said operating-handle being placed within convenient reach of the operator.

E indicates a shaft mounted in suitable hearings in the upper leg of the yoke, said shaft carrying at its rear extremity a gear e, meshing with the driving-pinion b. This shaft E also has mounted upon it a fixed spurgear e', which meshes with the spur-gear f, arranged upon a shaft F, mounted in thelower leg of the yoke. The shaft E, referred to, has a head e2, formed integral therewith upon its forward end, said head forming .a ange for laterally supporting the rotary shear G. This shear G is in the form of a disk ring, keyed upon a suit-able huh, its front face being engaged by a washerg, against which impiuges a nut g', arranged upon the threaded forward extremity of the shaft E. Shaft F, referred to, has a solid head j" for laterally supporting the rotary shear II, while a heavy washer h of slightly-less diameter than said shear H is arranged in front thereof, being held in position by a nut lr, threaded upon the forward extremity of shaft F. The manner of mounting these shear-plates on the shafts is extremely simple, as the solid heads on the shafts take up the longitudinal thrusts 4of the shears, the nuts and washers serving to clamp the shears in a fixed position and `preventing their longitudinal displacement.

` sheet metal, and after the shears are started to introduce one end of the metal to be cut between the shears, when said shears will grasp the metal and feed it forward until the entire strip or plate has been cut.

The machine shown in the drawings to the top of the driving-pulley is about six feet in height and in practice has cut boiler-plate three-eighths of an inch thick.

The guide-plate IOO It is frequently desirable to provide means whereby the plate to be cut can be cut on a curved line. The tendency of the plate in goingl through the shears is to have the cut follow a straight line, and it is possible by tu rning the forward edge of the plate to have the line of severance take a regular curve. In Figs. 4 and 5 I have shown a shoe K, mounted ou the bed-plate adjacent the rotary shears for cooperating with the fresh-cut edge at the forward end of the body portion of the plate. In front of this shoe are arranged a series of rollers L, adjustable transversely the travel of the plate, so as to gradually force the plate to travel in a curved path according to the line of its cut. By adjusting these rollers, and they are each separately adjustable, the line of severance of the plate can be made to follow any desired radius. The waste portion of the plate, as itis called, is pressed upwardly by the lower shear, and consequently is out of the path of the rollers, while the fresh-cut edge of the body portion of the plate is forced downwardly onto the bed-plate and is compelled to contact with the rollers, and in their effort to cut a straight line the shears will force the fresh-cut edge of the body portion of the plate to closely hug the rollers, as Will be Well understood.

One of the advantages of my improved rotary shears above described resides in the fact that the disks are made of plain steel, the periphery being perfectly smooth. The upper and lower disks overlap each other slightly, and when sheet metal is introduced therebetween one portion is forced upwardly and the other downwardly, so that a shearing cut is effected and the plate severed. This displacement is assisted by the extended bearing-face of the shear-disks, and the friction resulting from this extended bearing will cause the plate to be fed through the disks. Depending upon the thickness of the plate the frictional contact of the disks therewith in displacing the two portions of the plate increases or decreases as the thickness of the plate increases or decreases.

I am aware that minor changes in the arrangement, construction, and combination of the several parts of my device can be lnade and substituted for those herein shown and described without iu the least departing from the nature and principle of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a device of the ,character described, a pair of rotary shears, a stationary bed I occupying a plane therebetween, a shoe K on the said bed adjacent to said rotary shears, a plurality of guide-rollers, and means for adjusting said rollers on the stationary lbed transversely to the line of feed of the material to facilitate cutting material on a curved line, substantially as described.

2. In a device of the character described, a pair of rotary shears, a stationary table-bed I occupying a plane therebetween, a series of guide-rollers arranged adjacent to said rotary shears, and means for adjusting said rollers on the stationary bed transversely to the line of feed of the material, to facilitate cutting material on a curved line, substantially as described.

3. In a machine of the character described,a pair 0f shears, a bed occupying a plane therebetween,a series of guide-rollers arranged adjacent to the line of feed from the machine,and means for adjusting said rollers on the bed `transversely to said line of feed to facilitate the cutting of material on a curved line, substantially as described.

In testimony whereof I hereunto affix my signature, in the presence of two witnesses, this 6th day of May, 1901.

GEORGE W. MUDD,

Witnesses:

J. R. TAIT, J. W. DoRsEY. 

